Production of the Hydroxyl Radical and Removal of Formaldehyde by Calcined Green Tuff Powder and Tile

Toyohisa Fujita, Lanyin Zhang, Gjergj Dodbiba, Ji-Whan Anh, Yuezhou Wei, Hiromi Kurokawa, Hirofumi Matsui, Shigeki Yamamoto and Hiroshi Kawaguchi
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Toyohisa Fujita: College of Resources, Environment and Materials, Guangxi University, 100 Daxue Road, Nanning 530004, China
Lanyin Zhang: Graduate School of Engineering, the University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Gjergj Dodbiba: Graduate School of Engineering, the University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Ji-Whan Anh: Korea Institute of Geoscience and Mineral Resources (KIGAM), 92 Gwahang-no, Yuseong-gu, Daejeon 305-350, Korea
Yuezhou Wei: College of Resources, Environment and Materials, Guangxi University, 100 Daxue Road, Nanning 530004, China
Hiromi Kurokawa: Doctoral Programs in Medical Sciences, The University of Tsukuba, Tsukuba city, Ibaraki 305-8575, Japan
Hirofumi Matsui: Doctoral Programs in Medical Sciences, The University of Tsukuba, Tsukuba city, Ibaraki 305-8575, Japan
Shigeki Yamamoto: Towada Green-tuff AgroScience Co., Ltd. Meguro-ku, Tokyo 152-0011, Japan
Hiroshi Kawaguchi: Towada Green-tuff AgroScience Co., Ltd. Meguro-ku, Tokyo 152-0011, Japan

Sustainability, 2019, vol. 11, issue 12, 1-11

Abstract: Waste green tuff powder produced by cutting Towada stone has been utilized to eliminate formaldehyde related to greenhouse gases. The green tuff contains TiO 2 on zeolite as observed by scanning electron microscope (SEM)t. The green tuff is a natural catalyst that can produce hydrogen peroxide with moisture and oxygen with light. The optimum temperature for calcination of the green tuff powder has been investigated in order to produce hydroxyl radicals from the decomposition of hydrogen peroxide using ultraviolet light (UV) and no light. The green tuff calcined at 800 °C showed a high decomposition rate of hydrogen peroxide with no UV light under high alkaline conditions when measured by using ESR. With UV light, the optimum temperature for calcination of green tuff powder in order to reduce the hydroxyl radical was also 800 °C. Next, the powder calcined at 800 °C was used to produce the tile by compression and heating, and then the formaldehyde adsorption rate was measured. The green tuff powder calcined at 800 °C showed a high adsorption rate, similar to that of the activated carbon. The tiles formed at 40 MPa and heated at 1100 °C were the strongest and also showed adsorption with respect to formaldehyde. The adsorbed formaldehyde on the green tuff tile and powder was possibility decomposed by the hydroxyl radical produced by photocatalysis.

Keywords: green tuff; towada stone; calcination; recycle; tile; hydrogen peroxide; radical; ESR; adsorption; formaldehyde; UV; photocatalysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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